On Fri, Aug 30, 2024 at 10:14:20PM +1000, Eyal Lebedinsky wrote: > I assume that the generated list is a tree, so each leaf (Device/If) is on only one point. > > I note this output: > > $ lsusb -tv > /: Bus 001.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/16p, 480M > ID 1d6b:0002 Linux Foundation 2.0 root hub > [trimmed] > |__ Port 004: Dev 004, If 0, Class=Hub, Driver=hub/4p, 480M > [trimmed] > |__ Port 005: Dev 006, If 0, Class=Hub, Driver=hub/4p, 480M > [trimmed] > |__ Port 006: Dev 019, If 0, Class=Hub, Driver=hub/4p, 480M > ID 2109:2817 VIA Labs, Inc. > /: Bus 002.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/10p, 10000M > [trimmed] > |__ Port 006: Dev 006, If 0, Class=Hub, Driver=hub/4p, 5000M > ID 2109:0817 VIA Labs, Inc. > > I removed some content that is not relevant to my question. > > Note the Bus 001.Port 006 and Bus 002.Port 006 entries. > > I verified that both are for the same (one) device. They do not show when I disconnect it. > The device is an external 4-port USB3.0 hub. It is listed once as 480M and once as 5000M. > Nothing is plugged into any of the four ports. > > Is this correct? Why does this device show twice in the list? That's odd, as the same device shouldn't be on multiple busses. Busses are a "root port" on the system (i.e. a new PCI controller device), so are you sure you just don't have multiple devices with the same device/vendor id? What is the diff between running the command before and after removing a single device? thanks, greg k-h
